D-Link xStack DGS-3620-52P, Reference Manual

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xStack
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DGS-3620 Series Layer 3 Managed Stackable Gigabit Switch Web UI Reference Guide
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Multicast VLAN
In a switching environment, multiple VLANs may exist. Every time a multicast query passes through the Switch, the
switch must forward separate different copies of the data to each VLAN on the system, which, in turn, increases
data traffic and may clog up the traffic path. To lighten the traffic load, multicast VLANs may be incorporated.
These multicast VLANs will allow the Switch to forward this multicast traffic as one copy to recipients of the
multicast VLAN, instead of multiple copies.
Regardless of other normal VLANs that are incorporated on the Switch, users may add any ports to the multicast
VLAN where they wish multicast traffic to be sent. Users are to set up a source port, where the multicast traffic is
entering the switch, and then set the ports where the incoming multicast traffic is to be sent. The source port cannot
be a recipient port and if configured to do so, will cause error messages to be produced by the switch. Once
properly configured, the stream of multicast data will be relayed to the receiver ports in a much more timely and
reliable fashion.
The Multicast VLAN feature of this Switch does have some restrictions and limitations, such as:
Restrictions and Provisos:
1. Multicast VLANs can be implemented on edge and non-edge switches.
2. Member ports and source ports can be used in multiple Multicast VLANs. But member ports and source
ports cannot be the same port in a specific Multicast VLAN.
3. The Multicast VLAN is exclusive with normal 802.1q VLANs, which means that VLAN IDs (VIDs) and VLAN
Names of 802.1q VLANs and Multicast VLANs cannot be the same. Once a VID or VLAN Name is chosen
for any VLAN, it cannot be used for any other VLAN.
4. The normal display of configured VLANs will not display configured Multicast VLANs.
5. Once a Multicast VLAN is enabled, the corresponding IGMP/MLD snooping state of the VLAN will also be
enabled. Users cannot disable the IGMP/MLD feature for an enabled Multicast VLAN.
6. One IP multicast address cannot be added to multiple Multicast VLANs, yet multiple Ranges can be added
to one Multicast VLAN.
IGMP Multicast Group Profile Settings
Users can add a profile to which multicast address reports are to be received on specified ports on the Switch. This
function will therefore limit the number of reports received and the number of multicast groups configured on the
Switch. The user may set an IP Multicast address or range of IP Multicast addresses to accept reports (Permit) or
deny reports (Deny) coming into the specified switch ports.
To view the following window, click L2 Features > L2 Multicast Control > Multicast VLAN > IGMP Multicast
Group Profile Settings , as show below:
Figure 4-80 IGMP Multicast Group Profile Settings window
The fields that can be configured are described below:
Parameter Description
Profile Name Enter a name for the IP Multicast Profile.
Click the Add button to add a new entry based on the information entered.
Click the Find button to locate a specific entry based on the information entered.
Click the Delete All button to remove all the entries listed.
Click the View All button to display all the existing entries.